1. General Physics

1. General Physics Speed= - CORRECT ANSWER-distance÷time What is the shape of a distance-time graph when the object is at rest? - CORRECT ANSWER-a horizontal line What is the shape of a distance-time graph when the object is moving with constant speed? - CORRECT ANSWER-a slanted line What is the shape of a distance-time graph when the object is moving with changing speed? - CORRECT ANSWER-a curved line What is the distance traveled for motion with constant acceleration in a speed-time graph? - CORRECT ANSWER-the area under the graph If a body accelerates its speed-time graph will have a... - CORRECT ANSWER-positive gradient If a body decelerates its speed-time graph will have a... - CORRECT ANSWER-negative gradient What is the difference between speed and velocity? - CORRECT ANSWER-Velocity is a vector while speed is scalar. Velocity has a direction. a = - CORRECT ANSWER-∆v÷t Speed (on a distance-time graph) = - CORRECT ANSWER-the gradient Acceleration (on a speed-time graph) = - CORRECT ANSWER-the gradient On a speed-time graph, a straight line with a positive gradient means... - CORRECT ANSWER-constant acceleration On a speed-time graph, a curved line with a positive gradient means... - CORRECT ANSWER-changing acceleration Deceleration= - CORRECT ANSWER-negative acceleration The mass of a body = - CORRECT ANSWER-the number of particles it has Weight is a _____________ force - CORRECT ANSWER-gravitational What is the difference between mass and weight? - CORRECT ANSWER-Weight is affected by gravitational field strength W(Weight) = - CORRECT ANSWER-m×g How do you compare weights using balance? - CORRECT ANSWER-You put a weight on each side of the balance then whichever way the balance leans is the heaviest. What is 'inertia'? - CORRECT ANSWER-It is the idea that if a force is applied to an object, it will not immediately reach a high speed because it requires time to accelerate, as shown by the formula F=ma. Weight (definition) = - CORRECT ANSWER-A body's mass multiplied by the strength of the gravitational field around it. ρ = - CORRECT ANSWER-m×V